Using The Test Program To Troubleshoot The Heater, Flow Switch And Hi-Limit Thermostat From The Front Of Shi/U 43/53/68 Dishwashers - Bosch SHI 4302 Troubleshooting Tips

B
Using the test program to troubleshoot the
heater, flow switch and Hi-Limit thermostat from
the front of SHU/I 43/53/68 dishwashers
TEST
Entering test program
Starting test program
Skipping a test
Draining
Aqua Sensor calibration
Filling
Heating & Circulating
Draining
185ºF
Heater
F
Flow
switch
1st Edition/Revision 0-B
TIME
-----
-----
-----
30 seconds
65 seconds
Until water level switch closes
Until water reaches 150ºF
(rises ~ 2ºF/minute)
60 seconds
NOTE: Once its found one of these parts is faulty (from
High
incoming current being 1.5 - 2A), check each part (once tank
Limit
has been removed or blocked up) by measuring its
resistance at its terminals:
NOTES
On/Off
Press
press both the
Wash
buttons (SHU/I 43 models) or the
Wash Delicate/Econo
&
68 models). Indicating lights will flash.
Press both the
Wash
buttons (SHU/I 43 models) or the
Wash Delicate/Econo
&
68 models) a 2nd time.
Scrub Wash
Press
models) or
53 & 68 models).
Allow dishwasher to drain.
Not on SHU/I 43 models. Skip this test.
Can’t skip this test
Don’t run entire test (to save time) -- when
water starts circulating, measure current in
main power line to dishwasher. Skip test once
current has been measured. If current is ~
11A, heater, flow switch and Hi-Limit are OK.
If current ~ 1.5-2A, turn off dishwasher,
remove or block up tank and measure
resistance of heater, Hi-Limit & flow switch
(see below).
Last test. To end test program, press
On/Off
button (all models).
Heater ~ 11
n W
Hi-Limit ~ .3
n
Flow switch ~ .4
n
from heater housing & close its contacts to
measure this. A spring loaded plunger closes
microswitch when water is flowing.
button at the same time you
Power Scrub Plus
buttons (SHU/I 53 &
Power Scrub Plus
buttons (SHU/I 53 &
button (SHU/I 43
Regular Wash
button (SHU/I
W
W -- must remove microswitch
Tuesday, May 11, 1999
Page B-1
Regular
&
Scrub
Regular
&
Scrub